[mrkajz44]

I'm big in the camp of paying down the mortgage vs holding money and investing for two reasons:

1) The return on paying down your mortgage is 100% guaranteed. Yes, it is likely lower than the market in the long run, but market return is far guaranteed (and can be negative for long stretches)
2) Once you put the money on your mortgage it's used, whereas there is ongoing temptation to use the money you've invested - if you can take the invested money out and buy x,y,z it's a lot harder to stay disciplined and not spend it

I personally do a mix and consider the money I pay down on my mortgage as my "fixed rate" portfolio, and I'm on track to pay off the mortgage in 15 years instead of 25.